Search gender: all male female キソ Japanese Boy Names Variations. 1 names found. gender: all male female Name: kiso Katakana: キソ 0 Kanji: 木曽 Meaning: 木Tree. Wood. No frills. 曽Once You can save your favorite names with NAZUKE PON > About Japanese Names > Search Japanese Names By Kanji > キソ Japanese Boy Names Variations.